| 摘要 |
The invention relates to an apparatus for releasing a predetermined amount of a free-flowing medium into a fluid container, in particular the flushing cistern of a water closet. The apparatus comprises a pump, in particular diaphragm pump, which comprises an actuating plunger (6) that cooperates with a diaphragm (5) and is movable upward and downward by means of a float (7) as a result of change in the water level within the fluid container (20). The apparatus further comprises a reservoir (2) for the free-flowing medium, which is coupled to the input of the diaphragm pump, and a nonreturn valve (9) associated with an output (22) of the diaphragm pump. It is provided in accordance with the invention that the diaphragm (5) has a sacklike form and that the actuating plunger (6) acts at the end of the sack in such a way that during such action the diaphragm sack (5) is indented so as to enclose the contact surface (6a) of the plunger (6). The invention further relates to a holding device with which to attach the apparatus described above to a fluid container. It is provided in accordance with the invention that the holding device comprises a support rod (22) that can be attached at one end to a cage (25) or pump housing (3) and at its other end to the fluid container (20).
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